Grille ring for liquid fuel burners



Oct. 5, 1937. J. A. WILSON GRILLE RING FOR LIQUID FUELVBURNERS FiledJu1y`f27. 1935 Patented Oct. 5, 1937 l UNITED STATES GRILLE RING FOR.LIQUID FUEL BURNERS John'A. Wilson, Detroit, Mich., assgnor, by mesneassignments to The Timken-Detroit Axle Company, a corporation of OhioApplication July 27, 1933, Serial N0. 682,374

16` Claims.

This invention relates to liquid fuel burners of the rotary wall ametype wherein ignition and combustion take place around a hearth ringwhich is provided with a grille ring that serves to increase therapidity of the combustion and to hold the fiame down on said hearthring. The invention has for its principal objects to provide a strong,durable and light-weight grille ring of simple and economicalconstruction; to

increase the efficiency of said grille ring and t'o prolong the lifethereof; to enable the grille ring to be quickly and easily mounted onand dismounted from the hearth ring, and to provide a grille ring whichis quick to heat and cool.

The invention consists principally in providing the burner ring of suchburner with a metal grille ring; and it also consists in the parts andin the construction, combination and arrangement of parts hereinafterdescribed and claimed. Inthe accompanying drawing, which forms part ofthis specification and wherein like symbols refer to like parts Whereverthey occur.

Fig. 1 is a horizontal cross-section through the combustion chamber of afurnace equipped with a rotary fuel burner having a burner ringprovidedy with a metal grille embodying my invention,

Fig. 2 is an enlargedfragmentary plan view of the burner ring and metalgrille construction, FigliV is a vertical section'on the line 3 3 inFig. 2; and

Fig. 4 is a perspective view of one of the sections of the metal grillering. c

Referring to the accompanying drawing, my invention is shown inconnection with a furnace equipped with an oil burner `of the rotarywall flame type. `Said burner comprises a rotary distributor head Alocatedv at the center of the combustion chamber B of the, furnace, ametal 40 hearth plate C and a metal burner ring orAV ignition andcombustion ring D disposed arondithe periphery of said hearth plateadjacent to the wall of said combustion chamber. Any suitable ignitionmeans may be used', the means iilus'- trated comprising electric sparkignition devices E mounted in the burner ring D. The 'metal burner ringD, which is seated in suitable brack` ets or chairs I mounted on .thehearth' plate C, preferably comprises a trough orgutter 2, an upwardlyextending impact wall 3 disposed at the outer edge of said gutter, and aflange. il extending inwardly and dcwnwardly'from the inner edge of saidgutter to the hearth plate C.

In operation, the -oil spray is thrown outwardly from the rotarydistributor head A and strikes the -impact wall 3 above the gutter 2,ignition l and combustion initially taking place in said gutter and theame gradually lifting to the top of the burner ring when normalcombustion conditions are reached. v ,5 Mounted on the burner ring D isa grille ring F, which operates to increase the rate of mixing and tohold the flame down on said burner ring. Said lgrille ring is preferablymade of sheet metal of high heat conductivity, such as 10 high resistantchrome steel of comparatively thin section. The metal grille ring Fslopes downwardly and outwardly with its main body portion disposedoutwardly ofA said wall and with its inner marginal portion overhangingand spaced 15 above the upper edge of said wall. In order to obtain amaximum mixing effect over the entire -area of the grille, said grilleis disposed substantially at right angles tothe direction of the airiiow. The metal grille ring preferably comprises 20 sheet metal segmentsF that are arranged end fto end to form a substantially continuous ring.

Each segment comprises upstanding'inner and outer flanges 5 that areconnected by( a plurality ofbridges 6 that are spaced apart to form rec-25 dene the openings l. As there are three openings 'rl and four crossbridges 6, the total area of the openings is relatively large, beingabout thirty-seven per cent of the entirearea of the 35 bottom of thegrille and therefore almost as great as the area of the cross bridges.

Each' segment F is removably mounted on the y upstanding impact wall tofthe burner ring D by means of mounting strips 9 that are secured 40 tothe underside of the endmost bridges t of said segment, as by welding.The inner end portion lil of each mounting strip is bent downwardly andterminates at its lower end in split nger portions il that straddle theupper edge of the impact wall 3. The other or outer endr portion I2 ofeach mounting strip is inclined inwardly and downwardly and abuts at itslower end against the outer face of the impact wall 3 50 of the burnerring, thus preventing tilting of the grille 'ring onthe burner ring. Theangular pos'ition of the grille ring may be changed to obtain a maximumefficiency of combustion in a particular installation or for a given setof con 55 grille.

ditions by bending the end portions of the mounting strips.

'Ihe hereinbefore described metal grille ring has numerous advantages.The grille ring segments may be quickly and easily mounted on the burnerring in proper position. Being made of metal, the grille ring segmentsare strong and durable-and of light weight, can be held within veryclose tolerance limits as to all dimensions and can be quickly produced.Making the segments of metal also eliminates loss due to breakage andenables the segments to stand extreme temperatures and suddentemperature changes Without danger of breakage. 'Ihe present grille ringis rapid in its cooling and heating which are essential forthe'satisfactory operationi of the burner. The grille openings beingdisposed crosswise of the burner ring, each opening receivessubstantially the same amount of the combustible mixture, theriebysecuring av uniform distribution of the mixture around the The flangesalong t'he bridges cooperate therewith to form protected troughs facingin the direction of vapor and air flow, whereby the flame is retained insaid troughs regardless of the velocity of gas flow through theopenings.

Obviously, numerous changes may be made Without departing from theinvention. Therefore, I do not wish to be limitedto the preciseconstruction shown. For instance, while the grille ring is shown inconnection with a metal burner ring, it may also be used in connectionwith burner rings of refractory material,

What I claim is:

, 1. A liquid fuel burner of the Wall flame type comprising a combustionchamber closed by a hearth, means for supplying and discharging liquidfuel over' the hearth, a burner ring mounted above the hearth in thepath of the discharged fuel, a metal grille ring, and adjustablemounting means on 'said metal grille ring cooperating with said burnerring for making changes in the position of said metal grille ring onsaid burner ring.

2. A liquid fuel burner of the wall ame type comprising a combustionchamber closed by a hearth, means for discharging liquid fuel over saidhearth, a burner ring mounted above the hearth in the path of thedischarged fuel, a

metal grille ring mounted on said burner ring, and means on said metalgrille ring cooperating with said burner ring for properly positioningsaid metal grille ring on said burner ring, said means comprisingportions depending from said grille ring and adapted to engage the topand side respectively of said burner ring.

3. A liquid fuel burner of the wall flame type comprising a combustionchamber closed by a hearth, means for discharging liquid fuel over thehearth, a burner ring mounted above the hearth in the path of thedischarged fuel, and a metal grille ring mounted on said burner ring,said grille ring comprising a main body portion located above saidburner ring, said body portion being provided with a plurality oftransversely extending openings separated by transversely extendingtroughs. f

4. A liquid fuel burner of the Wall flame type comprising a combustionchamber closed bya hearth, means/ for discharging liquid fuel over thehearth, al burner ring mounted above the hearth in the path of thedischarged fuel, and a metal grille ring mounted on said burner ring,said metal grille ring comprising side flanges, a plurality of spacedcross-bridges connecting said.

side flanges, and flanges along the edges of said bridges.

5. A liquid fuel burner of thewall flame type comprising a combustionchamber closed by a hearth, means for discharging liquid fuel over saidhearth, a burner ring mounted above the hearth in the path of thedischarged fuel, and a metal grille ring mounted on said burner ring,said metal grille ring comprising side flanges, a plurality of spacedcross-bridges connecting said side flanges, and mounting strapsdepending from some of said bridges, said straps each having one portionshaped to cooperate with the upper edge of said burner ring and anotherportion shaped to abut against the outer face of said burner ring.

`6. A liquid fuel burner of the wall flame type comprising a combustionchamber closed by l hearth, means for discharging the liquid fuel in asubstantially horizontal path over said hearth, a metal burner ringmounted above the hearth in the path of the discharged fuel, and havinga gutter provided at its outer edge with an upstanding impact wall, anda metal grille ring mounted on said impact wall at an acute angle to theouter face of said impact wall.

7. A liquid fuel burner of the wall flame type comprising a combustionchamber closed by a hearth, means for discharging liquid fuel in asubstantially horizontal path above said hearth, a metal burner ringmounted abovethe hearth in the path of the discharged fuel and having agutter provided at its outer edge with an upstanding impact wall, and ametal grille ring mounted on said impact wall, said grille ring beingprovided with a plurality of elongated openings that extend crosswise ofsaid grille ring above the upper edge of said impact Wall.

8. In a liquid fuel burning apparatus, in combination with a combustionchamber having a hearth and an upright wall, fuel distributing means forprojecting a fuel'strcam toward said wall, a member providing a thinrefractory Wall spaced materially from said upright wall in thedirection of said fuel distributing means and spaced substantially abovesaid hearth, thereby to form a relatively large chamber between saidmember and the upright wall, means for causing air to ilow upwardly intointersection with the fuel stream adjacent the top of said thin wall,

and a flame-controlling grille work mounted' above said thin wall andoverhanging said large chamber.

9. In a liquid fuel burning apparatus of the type comprising means forprojecting fuel and air substantially horizontally in substantiallyindividual streams toward a surface to be heated, a structure having afuel impact wall and an air deilecting surface arranged below saidWallin the path of the air stream and of suicient height to change thecourse of the oncoming stream of air and direct it upwardly toward saidimpact Wall, and a metal flame-controlling apertured member of high heatconductivity and resistance mounted in proximity to said impact wall,said llamecontrolling member having a surface adjacent said impact walland disposed substantially at right angles to the flow of air passingsaid air deflecting surface.

A of the latter. I

-11. In a liquid fuel burning apparatus of the type comprising means forprojecting fuel and air in substantially individual streams toward asurface to be heated, a refractory member including a thin metal fuelimpact wall spaced materially inward'from said surface and spacedsubstantially above the hearth, thereby to form a relatively largechamber between said surface and the entire impact wall, and a metalflame-spreading member mounted above said impact wall in overhangingrelation to said chamber.

12. In 'a liquid fuel burning apparatus ofthe type in whicha combustiblemixture of liquid fuel and air is passed through a portion of thecombustion chamber to reach acombustion region at relatively highvelocity, a flame-controlling member disposed at said combustion regionin the path of said mixture, said member having two substantiallyparallel sides of appreciable area, one of which faces in the directionof the oncoming combustible mixture and the other of which facesoppositely thereto, said member having a set of upwardly opening pocketsfacing in the opposite direction.

13. In a liquid fuel burning apparatus of the type in which acombustible mixture of liquid fuel and air is passed through a portionof the combustion chamber to reach a combustion region at relativelyhigh velocity, a flame-controlling member disposed at said combustionregion in the path of said mixture, said member comprising means formingan elongated trough, the side Wall of said trough being arranged in thegeneral direction of travel of said mixture through said combustionregion and adapted to have the gases of combustion -travel in contacttherewith.

14. In a liquid fuel burning apparatus of the type in which acombustible mixture of liquid fuel and air is passed through a portionof* the combustion chamber to reach a combustion region at relativelyhigh velocity, a metal flame-4 controlling member disposed at saidcombustion region in the path of said mixture, said member havingpassages therethrough in the general 'direction .of travel of saidmixture through said combustion region, the total cross sectional areaof said passages being almost as great as the closed area of thatsurface of the member which faces the oncoming combustible mixture.

15. .In a liquid fuel burning apparatus of the type in which acombustible mixture of liquid fuel and air is passedthrough a portion ofthe combustion chamber to reach a combustion region at relatively highvelocity, a fuel and air mixing wall disposed at said combustion regionin the path of said 4combustible mixture, a flame-controlling member,and mounting means supporting said member above said Wall and having ananchoring element provided with a notch for reception of the upper edgeof said wall.

16.- rn combination with the hearth of an oilburning apparatus havingmeans for projecting the fuel across thehearth, a metal structure supvported on said hearth and having a thin upright wall in the path of fuelprojection, a name-controlling member formed of thin metal having lowresistance to heat transfer and high resistance to destruction ordeformation, and metal mounting means between said structure and said:damecontrolling member to support the latter above said thin Wall ofthe former.

JOHN A. WILSON.

